Welcome- I hope you realize those Continental racing tires are not suitable for the street. If your G is a track-only car, you'll have plenty of development to get those race tires to function properly.

In addition, it’s no wonder why they’re rubbing.... they are, at minimum, a whole inch taller than the tallest street size tire you should be running (lest you kill your rear gear advantage with these truck height tires).

In addition, it’s no wonder why they’re rubbing.... they are, at minimum, a whole inch taller than the tallest street size tire you should be running (lest you kill your rear gear advantage with these truck height tires).

Your better bet would be 305/640-18 if such exists.

How’d you decide on 680s to begin with?

They are 100 a pop new, i want the taller gear for autox so i can stay in 2nd. I'll update once i get further along

Welcome- I hope you realize those Continental racing tires are not suitable for the street. If your G is a track-only car, you'll have plenty of development to get those race tires to function properly.

Track set of tires... I am going to put on the hotchkis swaybay, guessing all the way stiff. play with disconnecting the rear, then perhaps coilovers

Track set of tires... I am going to put on the hotchkis swaybay, guessing all the way stiff. play with disconnecting the rear, then perhaps coilovers

OK- so you have a separate set of tires to take to and from the autocross site? And have you ever driven on a set of race tires? Otherwise, depending on compound, those tires car be slick as **** until they get some heat into them. Not sure how you're going to warm them up in the limited runs solo competition mandates.

OK- so you have a separate set of tires to take to and from the autocross site? And have you ever driven on a set of race tires? Otherwise, depending on compound, those tires car be slick as **** until they get some heat into them. Not sure how you're going to warm them up in the limited runs solo competition mandates.

The compound is between A7 / R7 in softness will need some warming up but luckily im in FL and should have no issues on 80+ degree days. Yes I've driven on slicks many times, yes I have street tires for street driving as you can see in the video above.

I think we both know it's not a classed car I just run with a vette club and wanting to keep up with fast guys as cheaply as possible

I have no way of knowing what kind of class you're running in. We have everybody from experienced SCCA National solo competitors on here to those who have very little practical experience. I try to provide a little help to everyone I can and was the reason I asked that question in the first place. Glad you could get some cheap race tires, but it's difficult to suggest how to optimize their use.

I have no way of knowing what kind of class you're running in. We have everybody from experienced SCCA National solo competitors on here to those who have very little practical experience. I try to provide a little help to everyone I can and was the reason I asked that question in the first place. Glad you could get some cheap race tires, but it's difficult to suggest how to optimize their use.

In road racing, we're often constrained by the rules. In SCCA Touring 3, Z33s must run a 245 profile tire and 700# max springs. My HR is also mandated to run 37 mm restrictors and weight 3275# for 2019. I've played with spring rates and swaybar settings and will sometimes go to other specs (T1) when I get frustrated with the rules.